[PATCH] hostapd: Don't force HT Mixed Mode for non-GF STAs

Helmut Schaa helmut.schaa at googlemail.com
Wed Mar 2 03:53:17 EST 2011


Am Mittwoch, 2. März 2011 schrieb Johannes Berg:
> On Wed, 2011-03-02 at 09:37 +0100, Helmut Schaa wrote:
> > Currently hostapd will force HT Mixed Mode if at least one non-GF STA is
> > associated. This will force _all_ HT transmissions to be protected.
> > 
> > 802.11n-2009 doesn't require HT Mixed Mode to be used in case of non-GF
> > STAs but instead the HT information element contains a flag if non-GF
> > STAs are present. All STAs are required to protect GF transmissions in
> > that case. Hence, setting HT Mixed mode if non-GF STAs are present is
> > superfluous.
> 
> It seems like this would still be relevant for the AP's TX?

Why? hostapd will configure the new ht_opmode (including the non-GF-STA flag)
to the driver. And the driver should do the right thing and enable protection only
for GF transmissions in that case, no?

Helmut


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